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Genus Reinwardtiodendron in Family Meliaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

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Genus Description

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The genus Reinwardtiodendron (Authority: Koord.) is a small, tropical member of Meliaceae, subfamily Swietenioideae. It comprises about four accepted species (POWO, 2024; WFO, 2024). The center of diversity lies in Malesia, especially Borneo and Sumatra, with additional records from Peninsular Malaysia and small parts of Thailand and New Guinea, occurring in lowland and hill dipterocarp forest, kerangas, and peat swamps below roughly 600 m (POWO, 2024; WFO, 2024). Reinwardtiodendron is characterized by pinnate or imparipinnate leaves, the leaflets often arranged in alternate to subopposite pairs, glabrous or variously pubescent indument, and the absence of pseudo-stipules. The inflorescences are axillary thyrses or panicles, usually shorter than the leaves. Flowers are functionally unisexual, a typical feature of many Meliaceae; the calyx is small and cupular, petals are valvate, and the short, annular disc may be partly fused to the androecium (Pennington and Styles, 1975). In staminate flowers the anthers are dorsifixed and introrse, and the receptacle is shallowly bowl-shaped, whereas in pistillate flowers the ovary is superior, typically 2-locular, and bears one to two ovules per locule on axile placentation (Pennington and Styles, 1975). The fruit is a drupe containing two seeds per locule; seedlings show characteristic meliaceous germination (Pennington and Styles, 1975).

Centers of diversity coincide with lowland Sundaland forests, with local endemics on peat swamp and kerangas sites, reflecting a moist-tropical, lowland edaphic specialization (POWO, 2024; WFO, 2024). Its intrinsic biology is otherwise poorly known, with no well-documented records of specific pollinators or dispersal syndromes, though frugivory by forest birds or bats is plausible given the drupe morphology.

In recent systematic treatments, Reinwardtiodendron is recognized as separate from Aglaia (Harley et al., 2023; WCSP, 2024), whereas some molecular work has suggested that a broader circumscription of Aglaia could encompass Reinwardtiodendron (Muellner et al., 2008). No solid base chromosome number for the genus has been established in the literature (Sinou et al., 2020).

Reinwardtiodendron has limited human relevance; it is occasionally encountered in local horticulture as an ornamental and contributes to mixed lowland forest stands, but it is not a major timber, crop, or widely cultivated ornamental (POWO, 2024). Conservation assessments remain incomplete; habitat loss through logging and conversion in peat swamp and kerangas areas poses a clear threat, with precise conservation status pending more comprehensive surveys (POWO, 2024; GBIF, 2024).

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